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M7 Clutch/Shifter Issues

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Old Feb 10, 2021 | 11:20 AM
  #1  
PolarBearLT4's Avatar
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Default M7 Clutch/Shifter Issues

I pinged on this group last week about my clutch pedal travel being inconsistent, and the pedal pressure was definitely getting soft. I'm pretty sure I need to flush the transmission fluid based upon everything I'm hearing.

My 2019 Z06/Z07 with 6500 miles is not a DD.

My question is would I damage the clutch, shift linkage or flywheel if I drive to the dealership. I don't have the ability to lift the vehicle to flush the tranny. So I'm taking it to the dealer about 6 miles away. The car has been sitting for several days. I noticed yesterday that I had a hard time getting into any gear. Should I have it towed to the dealer??

Thanks all, Mike
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Old Feb 10, 2021 | 06:22 PM
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Originally Posted by PolarBearLT4
I pinged on this group last week about my clutch pedal travel being inconsistent, and the pedal pressure was definitely getting soft. I'm pretty sure I need to flush the transmission fluid based upon everything I'm hearing.

My 2019 Z06/Z07 with 6500 miles is not a DD.

My question is would I damage the clutch, shift linkage or flywheel if I drive to the dealership. I don't have the ability to lift the vehicle to flush the tranny. So I'm taking it to the dealer about 6 miles away. The car has been sitting for several days. I noticed yesterday that I had a hard time getting into any gear. Should I have it towed to the dealer??

Thanks all, Mike
Your issue doesn't sound like a transmission fluid issue to me.

Sounds more like a clutch issue or clutch fluid issue.

Have you checked the clutch fluid level?

Last edited by KLG; Feb 10, 2021 at 06:27 PM.
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Old Feb 10, 2021 | 06:23 PM
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I am having a problem relating to how flushing the transmission fluid affects clutch performance. Inconsistent clutch pedal travel is due to issues with the clutch hydraulics. The clutch and transmission are separated from each other by about 3 or 4 ft (the length of the torque tube).

Flushing the transmission fluid might make the transmission shift easier and reduce gear clash when the transmission is cold but will do nothing to change the height at which the clutch pedal starts to engage.

Bill
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Old Feb 10, 2021 | 07:31 PM
  #4  
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Ya, brain cramp on my part...I was on a conference call as I typed my post. I meant clutch, not tranny. I couldn’t find Redline D4 at any of my local auto parts stores. Bought some ATF fluid so I could flush the system once I found the Redline. I originally felt it was dirty fluid. But I haven’t tracked the car, and 6500 miles feels like very low miles for the clutch fluid to be contaminated.

I did check the fluid level again today, the reservoir was empty. Yesterday, it appeared fine. But, It only took a small amount of fluid to fill. After filling I replaced the cap and pumped the clutch 30 times. Checked the level again and it was fine. Pumped another 30 times and fluid level held. And clutch travel and firmness returned.

I will check again tomorrow morning before heading to dealer. Now I’m thinking a small leak somewhere.

Premature worry on my part I suspect.

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Old Feb 10, 2021 | 08:32 PM
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Originally Posted by PolarBearLT4
Ya, brain cramp on my part...I was on a conference call as I typed my post. I meant clutch, not tranny. I couldn’t find Redline D4 at any of my local auto parts stores. Bought some ATF fluid so I could flush the system once I found the Redline. I originally felt it was dirty fluid. But I haven’t tracked the car, and 6500 miles feels like very low miles for the clutch fluid to be contaminated.

I did check the fluid level again today, the reservoir was empty. Yesterday, it appeared fine. But, It only took a small amount of fluid to fill. After filling I replaced the cap and pumped the clutch 30 times. Checked the level again and it was fine. Pumped another 30 times and fluid level held. And clutch travel and firmness returned.

I will check again tomorrow morning before heading to dealer. Now I’m thinking a small leak somewhere.

Premature worry on my part I suspect.
Hopefully you did not fill your car's clutch fluid reservoir with the Redline or any other ATF. GM calls for DOT 4 brake fluid for the clutch hydraulic system: Hydraulic Clutch Fluid (GM Part No. 19299570).

I use Pentosin Super DOT 4 in mine.

--KLG--

Last edited by KLG; Feb 10, 2021 at 08:42 PM.
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